Eat a well rounded and healthy diet.
The most important thing you can do for your long term health is to learn how to eat correctly. It may make you scratch your head a little bit but the truth is that your teeth yellowing can be a sign of a malnourished body that doesn’t get enough nutrients. There is living tissue inside of your teeth and when it is aging prematurely due to your poor diet you are going to see yellowing in the dentin as a result. While there are chemical and procedural steps you can take to whiten your teeth you should know that eventually your dentin becomes an irreversible shade. So do your duties now to keep your mouth and body clean and working together.